FR-A5ND
DeviceNet
Communications Option Unit
9
2.4
Connection to Network
At this point the option unit should be installed in the VFD, the address
switches properly set, the cable constructed, and the connector connected
to the option unit through the option data port.
CAUTION:
Do not connect cable to the network until told to do so.
1. Check that power is turned off to the VFD.
2. Make sure that the terminating resistor is installed at each end of the
trunk cable, as shown in Figure 2-6. These resistors must meet the
following requirements:
a) R = 121 ohms
b) 1% metal film
c) 0.25 Watts
3. Connect cable to network as follows:
a) If the trunk connector is a DeviceNet sanctioned pluggable or sealed
connector, the connection to the active network can be made at any
time whether VFD is on or off. The option unit automatically detects
when the connection is completed.
b) If connecting to the network with free wires, power to the network and
VFD should be shut off as a safety precaution in case two or more
signal wires are accidentally shorted together.
4. Check that all connections are completed, and all necessary wires not
associated with DeviceNet are connected to the VFD unit
5. It is now safe to apply power to the VFD and run it in the PU or external
mode.
